18925814225 has 18 divisors (see below), whose sum is σ = 24045996114. Its totient is φ = 14767929600.

The previous prime is 18925814209. The next prime is 18925814249. The reversal of 18925814225 is 52241852981.

It can be written as a sum of positive squares in 9 ways, for example, as 9378179281 + 9547634944 = 96841^2 + 97712^2 .

It is not a de Polignac number, because 18925814225 - 2⁴ = 18925814209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18925814225.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4402277 + ... + 4406573.

It is an arithmetic number, because the mean of its divisors is an integer number (1335888673).

Almost surely, 2^18925814225 is an apocalyptic number.

It is an amenable number.

18925814225 is a deficient number, since it is larger than the sum of its proper divisors (5120181889).

18925814225 is an frugal number, since it uses more digits than its factorization.

18925814225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8645 (or 4343 counting only the distinct ones).

The product of its digits is 460800, while the sum is 47.

The spelling of 18925814225 in words is "eighteen billion, nine hundred twenty-five million, eight hundred fourteen thousand, two hundred twenty-five".